当我们使用现在完成式时，是和现在有关联的。
When we use the present perfect, there is a connection with now.
以上是一些完成式之间的微妙差异。
These are just some of the shades of difference between the perfect tenses.
现在完成式强调过去所发生的事情对现在的影响。
The present perfect tense emphasizes the effect of the past action on the present.
现在完成式强调过去所发生的事情对现在的影响。
The present perfect tense emphasizes the effect of the past action on the present.
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